Career
He has written almost two hundred books Most of them are non-fiction for young people. According to WorldCat there are "132 works in 188 publications in 12 languages and 8,912 library holdings." He writes mainly on factual material, fun (puzzles, quizzes, jokes, and games) and magic for children, and has also edited magic magazines The Circular and Abracadabra, and written scripts for television shows including The Weakest Link.
He was involved in curating the Circle"s museum in the 1970s and edited the Circle"s magazine The Circular from 1990-1998.
